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检索条件"机构=Beijing Key Laboratory for Network System Architecture and Convergence"

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A community-based opportunistic routing protocol in delay tolerant networks 4

A community-based opportunistic routing protocol in delay to...

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4th IEEE International Conference on Computer and Communications, ICCC 2018

作者： Haoran, Sun Muqing, Wu Yanan, Cao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Post and Telecommunications Beijing China

ISBN: (纸本)9781538683392

In Delay Tolerant networks (DTN), the nodes are sparse and intermittently connected, the end-to-end connectivity between nodes is rare. To overcome the intermittent connectivity, DTN routing protocols employ the 'store-carry-forward' strategy to transmit messages. A message is delivered to a destination node from a source node via opportunistic contacts between intermediate nodes. In addition, nodes in DTN have a feature of community. In a community, network node meet each other regularly, while between communities there are only few encounter opportunities. In this paper, we propose a community-based opportunistic routing protocol which works in two modes, the Intra-community mode and the inter-community mode. In Intra-community message transmission, we adopt reasonable forwarding conditions and E-PRoPHET algorithm to design the transmission mechanism. In inter-community message transmission, we use the communication probability and the remaining energy to select the most suitable forwarding node. All of these are designed to limit the number of copies of messages, so as to ensure the performance of the algorithm. We extensively simulated our proposal and have shown that our proposed protocol can raise the delivery ratio, reduce the delivery delay and improve the efficiency of forwarding messages. © 2018 IEEE.

关键词： Delay tolerant networks

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A Connectivity Probability Based Cross-Layer Routing Handoff Mechanism in Software Defined VANETs

A Connectivity Probability Based Cross-Layer Routing Handoff...

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IEEE Conference on Vehicular Technology (VTC)

作者： Yangshui Gao Tao Luo Yijun Guo Xinxin He Beijing Laboratory of Advanced Information Networks and Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

In order to adapt to different vehicle densities, a path connectivity probability based cross-layer routing handoff mechanism is proposed under software defined vehicle ad hoc networks (SDVN). In this mechanism, we employ the derived path connectivity probability model to predict the density degree of a path, which will be used to decide whether to use base stations (BSs) assisted routing or V2V cross-layer routing. Particularly, in the process of performing V2V cross-layer routing, we utilize the information such as connectivity probability, transmission rate, and load to further improve the effectiveness of the proposed mechanism. Simulation results show that our proposed routing algorithm achieves significant gains in terms of delivery ratio and average delay, compared with several existing routing protocols.

关键词： Routing Roads Vehicular ad hoc networks Routing protocols Software Lead

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Design and analysis of dual-channel structure for software-defined wireless sensor networks 4

Design and analysis of dual-channel structure for software-d...

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4th IEEE International Conference on Computer and Communications, ICCC 2018

作者： Ziyin, Wang Muqing, Wu Min, Zhao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Post and Telecommunications Beijing China

ISBN: (纸本)9781538683392

Traditional software defined wireless sensor networks (SDWSN) fails to reduce the packet loss rate and delay due to the collision of packets in a single frequency channel. Considering a large network with numerous nodes, how to solve this issue becomes extremely essential. So, in this paper, we propose an SDWSN network architecture based on dual frequency channels (dual-channel structure), which enables topology control information and sensing data information to be transmitted in two independent frequency channels. To compare with single channel mode, we simulated the dual-channel structure based on the first order radio model. The numerical results show that the dual-channel structure has better performance on reducing network energy consumption and packet loss rate. The advantages of the dual-channel structure are also analyzed through hardware test. The test results show that the dual-channel structure is better than the traditional single channel structure in terms of node lifetime, delay and packet loss. © 2018 IEEE.

关键词： Energy utilization

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Design and analysis of software-defined wireless sensor network based on mobile agent topology discovery 4

Design and analysis of software-defined wireless sensor netw...

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4th IEEE International Conference on Computer and Communications, ICCC 2018

作者： Tian, Wang Muqing, Wu Min, Zhao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Post and Telecommunications Beijing China

ISBN: (纸本)9781538683392

In wireless sensor network, how to quickly match the real-time changing network and reduce the energy consumption in the topology discovery process has been a hot research topic, especially in the network with a large amount of mobile nodes. This paper proposes an improved mobile agents topology discovery (IMATD) protocol for software-defined wireless sensor network (SDWSN). This protocol uses mobile agents (MA) to quickly and efficiently go through each node in the network and collect their topology-related information so that each node can obtain the entire network's topology information. And the mobile agents report and update collected topology information to the controller periodically, so the controller can achieve efficient network management. The simulation results show that the proposed protocol can effectively reduce topology discovery convergence time, reduce topology discovery energy consumption, and balance node energy distribution of the entire network. © 2018 IEEE.

关键词： Energy utilization

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network-balanced algorithm based on hierarchical subnet space for software-defined wireless sensor networks 4

Network-balanced algorithm based on hierarchical subnet spac...

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4th IEEE International Conference on Computer and Communications, ICCC 2018

作者： Yajun, Li Muqing, Wu Min, Zhao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Post and Telecommunications Beijing China

ISBN: (纸本)9781538683392

Software defined wireless sensor network (SDWSN) is a new network architecture for sensor networks. It provides an information monitoring and management technology solution for wireless sensor network, and has become a research hot spot in recent years. Despite the advantages of SDWSN, there are still some unavoidable problems such as over concentrated load and imbalanced energy consumption with the increase of network scale. To deal with the shortages of load and energy balance in SDWSN, we propose a new hierarchical subnet space based network balance algorithm. The proposed algorithm innovatively optimizes the network structure and forwarding rules of SDWSN. Fog computing is also applied to reduce packet transmission requirement, which helps to further balance load and reduce energy consumption. In our optimized network structure, the whole network is divided into several subnets and sub-controllers are selected for each subnet. Sensor data packets are collected and compressed in the sub-controller and sent to the center controller along the path consisted of sun-controllers. Simulation results show that our proposed algorithm performs better than other existed algorithms in load balancing and energy saving. © 2018 IEEE.

关键词： Wireless sensor networks

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Beam Search Assisted User Scheduling for mmWave Hybrid Beamforming systems

Beam Search Assisted User Scheduling for mmWave Hybrid Beamf...

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Computing, Communications and Applications Conference (ComComAp)

作者： Yu Chen Huiwen Wu Danpu Liu Beijing Laboratory of Advanced Information Network Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing P.R. China

ISBN: (数字)9781728119731

ISBN: (纸本)9781728119748

User scheduling in mmWave multi-user multiple-input multiple output (MU-MIMO) systems involves the joint optimization of user selection and beam pair selection due to its hybrid beamforming architecture. Most of the existing solutions are based on ideal channel state information (CSI). How to choose the users to be scheduled and their beams for operation in the case of non-ideal CSI is still challenging. In this study, we propose a blind beam search assisted user scheduling (BSUS) algorithm operating in the absence of ideal CSI. The proposed method consists of two steps. In the first step, the beam information acquired in the initial beam training is used to identify the channels' orthogonality and classify the users into groups. In the second step, a scheduled user is chosen from each group to maximize the equivalent channel energy. Subsequently, the selection of beam pairs for communication is simplified owing to the information acquired in initial beam training. Simulation results show that the proposed scheme can achieve 93.6% of the maximal sum rate, and maintain a low computational complexity.

关键词： Radio frequency Array signal processing Job shop scheduling Training Computational complexity MIMO communication

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Energy-Balanced Clustering Algorithm for Software-Defined Wireless Sensor networks

Energy-Balanced Clustering Algorithm for Software-Defined Wi...

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International Conference on Computer and Communications (ICCC)

作者： Zou Haosen Wu Muqing Liu Boyang Beijing Key Laboratory of Network System Architecture Convergence Beijing University of Posts and Telecommunications Beijing P.R.China

ISBN: (数字)9781728147437

ISBN: (纸本)9781728147444

The energy supply of sensor nodes is limited, and the sensor nodes near the sink node usually die out earlier than other nodes which causes the imbalance of energy consumption in wireless sensor network (WSN). In order to extend the network lifetime and balance the energy consumption, we present a new clustering algorithm called Energy-balanced Clustering Algorithm (EBCA) based on software-defined wireless sensor network (SDWSN). In our algorithm, the controller redefines the communication radius of each sensor node based on distance from sink node and the number of neighbor nodes, and gives a new clustering method based on the residual energy of itself and its neighbor node. The simulation results show that our algorithm has better performance on balancing energy consumption and extending network lifetime compared with the typical data transmission algorithm.

关键词： Clustering algorithms Wireless sensor networks Energy consumption Routing network topology Wireless communication Protocols

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Beam reconfigurable antenna based on liquid crystal metasurface 4

Beam reconfigurable antenna based on liquid crystal metasurf...

引用

4th IEEE International Conference on Computer and Communications, ICCC 2018

作者： Liu, Li Deng, Li Li, Shufang Zhang, Chen Wang, Ling Qu, Meijun Beijing Key Laboratory of Network System Architecture and Convergence Beijing Laboratory of Advanced Information Network Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781538683392

A novel design method of electronically controlled beam reconfigurable antenna using liquid crystal metasurface is presented in this paper. The metasurface is a two-dimensional plane composed of a series of sub-wavelength liquid crystal unit cells. The beam in desired radiation direction can be achieved by varying the impedance distribution of liquid crystal metasurface according to microwave holographic technique. In the simulation, we can obtain an arbitrary radiation direction beam within the zenith angle range of 35°∼60° at 39 GHz, and the maximum gain reaches 10.65 dB. Such a beam reconfigurable antenna with low profile (44\ \mathbf{mm}\ast 44\ \mathbf{mm}\ast 2.15\ \mathbf{mm}) and continuously adjustable beam has great value in practical applications of mobile communications. © 2018 IEEE.

关键词： Liquid crystals

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Energy consumption optimization scheme of cloud data center based on SDN 8

Energy consumption optimization scheme of cloud data center ...

引用

8th International Congress of Information and Communication Technology, ICICT 2018

作者： Liao, Qing Wang, Zun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

In response to the mobile Internet, Internet of things and cloud computing technology fast development, the operation of large-scale distributed computing cloud data center construction in the world at the same time, the network data calculation of energy consumption problem is causing extensive concern. And the software-defined network (SDN) provides a feasible solution to the rigid problem of traditional network architecture. Based on SDN technology, this paper proposes a method of energy consumption control based on cloud data center. Aiming at server energy saving, the multi-objective optimization model of virtual machine migration integration is established, and the integration mechanism of virtual machine migration based on mixed single-parent genetic algorithm is proposed. The experimental results show that the algorithm can be used to solve the problem of virtual machine migration and integration in data center. © 2018 The Authors. Published by Elsevier Ltd.

关键词： Genetic algorithms

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Machine Learning Based Task Scheduling for Wireless Powered Mobile Edge Computing IoT networks

Machine Learning Based Task Scheduling for Wireless Powered ...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Jianqi Xie Sihua Wang Changchuan Yin Beijing Laboratory of Advanced Information Network Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing P. R. China

The following topics are dealt with: learning (artificial intelligence); wireless channels; optimisation; resource allocation; cellular radio; probability; MIMO communication; error statistics; telecommunication compu... 详细信息

关键词： Task analysis Delays Servers Wireless communication Wireless sensor networks RFID tags Computational modeling

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